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utils.go
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/
utils.go
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package java
import (
"bytes"
"fmt"
"os/exec"
"regexp"
"strings"
)
var javaVersionCommand = []string{"java", "-version"}
func javaVersionInfo() (version, runtime, vm string, err error) {
var out bytes.Buffer
cmd := exec.Command(javaVersionCommand[0], javaVersionCommand[1:]...)
cmd.Stdout = &out
cmd.Stderr = &out
err = cmd.Run()
if err != nil {
err = fmt.Errorf("failed to check java version: %v", err)
return
}
version, runtime, vm = parseJavaVersionOutput(out.String())
return
}
func parseJavaVersionOutput(infoString string) (version, runtime, vm string) {
infoString = strings.TrimSpace(infoString)
lines := strings.Split(infoString, "\n")
if strings.Contains(lines[0], "Picked up _JAVA_OPTIONS") {
lines = lines[1:]
}
if len(lines) < 3 {
// unexpected output format, don't attempt to parse output for version
return "", "", ""
}
versionString := strings.TrimSpace(lines[0])
re := regexp.MustCompile(`version "([^"]*)"`)
if match := re.FindStringSubmatch(lines[0]); len(match) == 2 {
versionString = match[1]
}
return versionString, strings.TrimSpace(lines[1]), strings.TrimSpace(lines[2])
}